When your prestige exceeds 510k, two things happen:
1. You lose a fixed amount of prestige daily
2. You gain attack and defense bonuses.

range: daily loss / %attack bonus / %defense bonus

510k to 520k: -2k / 5 / 0
520k to 530k: -3k / 5 / 5
530k to 540k: -4k / 10 / 5
540k to 550k: -5k / 10 / 10
550k to 560k: -6k / 15 / 10
560k to 570k: -8k / 15 / 15
570k to 580k: -10k / 20 / 15
580k to 590k: -12k / 20 / 20
590k to 600k: -15k / 25 / 20
> 600k: -20k / 25 / 25